单项选择题
A.纵向排烟 B.横向排烟 C.复合排烟 D.重点排烟
A.1.00h B.1.50h C.2.00h D.3.00h
A.20m,10Ω B.20m,15Ω C.30m,10Ω D.30m,15Ω
A.1.50h,甲级 B.2.00h,乙级 C.3.00h,甲级 D.2.50h,乙级
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